20500666613 has 8 divisors (see below), whose sum is σ = 24448000128. Its totient is φ = 16807999824.

The previous prime is 20500666591. The next prime is 20500666651. The reversal of 20500666613 is 31666600502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20500666613 - 2⁸ = 20500666357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500666213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63666506 + ... + 63666827.

It is an arithmetic number, because the mean of its divisors is an integer number (3056000016).

Almost surely, 2^20500666613 is an apocalyptic number.

20500666613 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20500666613 is a deficient number, since it is larger than the sum of its proper divisors (3947333515).

20500666613 is a wasteful number, since it uses less digits than its factorization.

20500666613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127333363.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 20500666613 in words is "twenty billion, five hundred million, six hundred sixty-six thousand, six hundred thirteen".